I have collections with DateTime field which have datetime value saved in UTC, with time.
I like to find all record between time 8 AM to 6 PM regardless date. I have tried following query:
{ $expr: { $gte: [ { $hour: "$DateTime" }, 8 ]} }
This query is working fine to get record after 8 AM, regardless date. I am unable to find query with $lte in same match. This query is not working:
{ $expr: { $gte: [ { $hour: "$DateTime" }, 8 ], $lte: [ { $hour: "$DateTime" }, 18 ]} }
Error: An object representing an expression must have exactly one field: { $gte: [ { $hour: "$DateTime" }, 8 ], $lte: [ { $hour: "$DateTime" }, 18 ] }
Any help would be appreciated. If this can be done in Mongo dotnet core then that would be great using lamda expression.
One of the simple ways to perform time-only comparison will be convert to string using $dateToString and perform string comparison.
db.collection.aggregate([
{
$match: {
$expr: {
$and: [
{
$gte: [
{
"$dateToString": {
"date": "$DateTime",
"format": "%H:%M:%S"
}
},
"08:30:00"
]
},
{
$lte: [
{
"$dateToString": {
"date": "$DateTime",
"format": "%H:%M:%S"
}
},
"18:30:00"
]
}
]
}
}
}
])
Here is the Mongo playground for your reference.
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